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. 2016 Nov;41(6):507–517.

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Copyright: © Iranian Journal of Medical Sciences

This is an open-access article distributed under the terms of the Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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The microscopic appearance of H&E staining of defects in the trochlear groove at four weeks after surgery, respectively (Original magnification=200×). A) Control group: The defect is concave and a noticeable thin layer of non-cartilaginous tissue. B) PRP group: The defect is filled by fibrous tissue with a crack. C) PRF group: The defect is covered by fibrous tissue. D) Gel+SDF₁ group and (E) PRP+SDF₁ group: The defects in both groups are filled with a repaired tissue, which are thinner than the normal surrounding cartilage. F) PRF+SDF₁ group: The defect is entirely filled by the repaired tissue, resembling the healthy cartilage surrounding the tissue.